Behavior

Adult sea spiders are solitary but often live in close association with invertebrate food hosts or seaweeds. Species with smaller body size move slowly around the substrate, while the larger deep-sea pycnogonids tend to be more active; some even swim, using leg motions similar to walking.

A sea spider (Pycnogonum littorale) feeding on anemone in the Gulf of Maine. (Photo by Andrew J. Martinez/Photo Researchers, Inc. Reproduced by permission.)

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